Apparatus for straining paper-pulp, &amp;c.



PATBNTED MAY 19, 7,1903.

J. WHITE. I APPARATUSTOR STRAINING PAPER Pun-am.

APPLICATION FILED JAN. 6, 1902.

r 3 SHEETS-SHEET 1.

H0 MODEL.

fit Vii/LIZ" PATENTED MAY 19, 1903.

J. WHITE; APPARATUS FOR STRAINING PAPER PULP, 8w.

APPLICATION TILED JAN. 6, 1902.

wihessas PATENTED MAY 19,1903,

J. WHITE. APPARATUS Pun STRAINING PAPER PULP, M.

APPLIOATIOH FILED JAN. 6,1902;

3 SHEETS-SHEET 3..

K0 MODEL.

THE NORR| S #Ergngcomudvmxmn. WASHINGTON,- o. c.

UNITED STATES Patented May 19, 1903.

PATENT. OFFICE.

APPARATUS FOR STRAINING PAPER-PULP, 81.0.

SPECIFICATION forming part of Letters Patent No. 728,346, dated May 19, 1903. Application filed January 6, 1962. serial No. 88,652. (No model.)

To all whom it may concern:

Be it known that I, JOHN WHITE, a citizen (for which application for patent has beenmade in Great Britain, No. 24,381, dated November 30, 1901,) of which the following is a specification.

In a well-known type of apparatus for straining paper-pulp and described in the British patent of Roeckner, No. 7,932 of 1885, the pulp contained within a stationary vat is caused to pass through the-perforated shell or drum of a cylindrical, prismatic, or similar vessel arranged to oscillate upon a central concentric shaft or axis, the strained pulp passing off through a flexible outlet connection to a separate boxoutside of the vat. Within the drum radial division-plates, partitions, or fans are fixed, and as the drum oscillates to and fro these produce a pulsating action or alternate suction and expulsion of the pulp passing through the perforations or slits of the drum.

My invention has for its object, besides generally improving the construction of pulpstraining apparatus of this type, to obtain; greater area of strainer-plates in any given I 'nected by a straight flexible tube h to the end size of vat and render the strainer more ef- 'fective, while by increasing the'number of.

outlets to two or more, and thus decreasing their diameter, so improving the flexible outlet connections from the oscillating strainer as to lessen the twisting action, and thus re duce wear and tear.

The invention is illustrated by the accom= panying drawings, in which- Figure .l is a longitudinal sectional elevation. Fig. 2'is a cross-section, and Fig. 3 a part plan, of the improved strainer.

As shown by the drawings, the improved strainer is composed of a number of strainer drums, cylinders, or elongated tubular vessels a, a, secured to. and alongside a central rocking shaft 1), with their axes parallel or approximately parallel to the axis of oscillation instead of being, as heretofore, concentric therewith, the shaft-b being carried in bearings at the ends of a trough-like vat c, within which the strainer oscillates immersed in the pulp which is fed into it through one end of the vat. In the arrangement illustrated two drums or straining vessels (1 a are secured to the oscillating shaft 1) within the vat c,

the straining vessels being each by preference of the form of partially-flattened tubes/or barrels or of double oonvex or lozenge shape in cross-section, with their major axes vertical, so as to provide as large a surface as possible within a restricted width of vat. The drums or vessels (1 a are divided by partition-plates a, preferably extending vertically across the axis, so as to form cells or compartments in each drum a, and these division-plates may be flat or corrugated or straight or inclined. The ends of the straining vessels are formed by plates a secured to the oscillating shaft 1), and on these plates may be formed flanges a to which the strainer-plates d, constitutvby clip-plates.

Each drum or straining vessel a is conof the vat leading into a delivery-box 71, common. to each outlet. These flexible tubes may be'placed in any position below the axis of oscillation. I

The oscillation of the shaft b may be conveniently effected by a crank or lever arm j, fixed on it and connected to an eccentric or like device on a rotating shaft.

Having now described the invention, What I' claim, and desire tosec'ur'e by Letters Patent, is-- 1. A pulp-strainer composed ofa plurality of strainer-drums or elongated tubular vessels arranged within a vat or trough, and a central rocking shaft to and alongside which said drums are secured with their axes parallel to the axis of said shaft, substantially as described.

2. In a pulp-strainer the combination with avatanda rock-shaft extending therethrough, In Witness whereof I have hereunto set my of two drums 0 flattened tubular vessels sehand in presence of two Witnesses. cured one to either side of and parallel to JOHN WHITE.

said shaft, the shells of said drums being com- 5 posed of strainerplates and flexible tubes Witnesses:

connecting their ends and a delivery-box with- WALLACE FAIRWEATHER, out the vat, substantially as described. JNo. ARMSTRONG, J 1-. 

